| Experimental study on alfalfa’s canopy resistance and its variation under reference condition |
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| DOI：10.7606/j.issn.1000-7601.2009.05.20 |
| Key Words: reference crop evapotranspiration canopy resistance alfalfa |
| Author Name | Affiliation | | QIANG Xiaoman | Key Laboratory for Agricultural Soil and Water Engineering in Arid Area of Ministry of Education Northwest A＆F University, Yangling, Shaanxi 712100, China；Farmland Irrigation Research Institute CAAS, Xinxiang, He’nan 453003, China | | CAI Huanjie | Key Laboratory for Agricultural Soil and Water Engineering in Arid Area of Ministry of Education Northwest A＆F University, Yangling, Shaanxi 712100, China | | ZHOU Xinguo | ；Farmland Irrigation Research Institute CAAS, Xinxiang, He’nan 453003, China | | WANG Jian | Key Laboratory for Agricultural Soil and Water Engineering in Arid Area of Ministry of Education Northwest A＆F University, Yangling, Shaanxi 712100, China |
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| Abstract: |
| Canopy resistance, an important parameter for calculation formula of reference crop evapotranspiration, has momentous significance for accurate calculation of reference crop evapotranspiration and diagnosing Crop-Water-Stress.With the presumed conditions of ET0 equation by FAO as a starting point, this article studies alfalfa's canopy resistance with measured data.The results show that the variation of canopy resistance increases with growth proceeding.The diurnal variation curve of canopy resistance takes the shape of “U”, whose minimum point appears at noon (lower than 50 s·m-1) and maximum point appears at 8∶00 and 18∶00 (higher than 100 s·m-1) . |
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